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So far, all is fine, glxgears gives 1900fps (Radeon HD 4670) and I can play UT2004-demo without problems or graphical errors.

BUT: turning on the desktop effects does not work:
when using OpenGl the speed is so slow, that the system becomes unusable;
when using "XRender" I cannot use most of the effects, like snow or the desktop-switching-cube. It does not matter if I am using kernel 2.6.32.3 or a 2.6.33-rcX - problem is the same.

does anybody else experience similar problems and how do you solve it?
TIA

(WW) RADEON(0): Option "GARTSize" is not used
(WW) RADEON(0): Option "VideoOverlay" is not used
(WW) RADEON(0): Option "OpenGLOverlay" is not used
(WW) RADEON(0): Option "TexturedVideo" is not used
(WW) RADEON(0): Option "XAANoOffscreenPixmaps" is not used
(WW) RADEON(0): Option "UseInternalAGPGART" is not used